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Taxonomic status of the isolated populations of tui chub referred to Gila bicolor oregonensis (Snyder)

Creator:: Bills, Frederick T.
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF FREDERICK TAYLOR BILLS for the

Foraging ecology of caspian terns and double-crested cormorants in the Columbia River Estuary

Creator:: Lyons, Donald E.
Abstract:: A detailed understanding of the foraging ecology of species preying upon threatened or endangered prey may contribute to identifying and evaluating management options to reduce predation, when such management is deemed appropriate. In the Columbia River estuary, Caspian terns (Sterna caspia) and double-crested cormorants (Phalacrocorax auritus) have been identified as...
Resource Type:: Masters Thesis
Full Text:: ESTUARY Donald E. Lyons, Daniel D. Roby, and Ken Collis 8 verification. 9 AB S TRACT We examined

Bioenergetics-based predator-prey relationships between piscivorous birds and juvenile salmonids in the Columbia River estuary

Creator:: Lyons, Donald E.
Abstract:: This dissertation focuses on the predator-prey relationship between two species of avian predators, Caspian terns (Hydroprogne caspia) and double-crested cormorants (Phalacrocorax auritus), and one of their important prey types, juvenile salmonids (Oncorhynchus spp.), in the Columbia River estuary of Oregon and Washington states during the period 1998 – 2007. I...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERATION OF Donald E

Extrinsic and Intrinsic Factors Associated with Reproductive Success of Caspian Terns (Hydroprogne caspia) at East Sand Island, Columbia River Estuary

Creator:: Bailey, Olivia A.
Abstract:: Declines in wild salmonid (Oncorhynchus spp.) populations in the Columbia River basin have resulted in managers identifying that avian predation on juvenile salmonids is an important limiting factor for salmonid recovery. Caspian Terns (Hydroprogne caspia), particularly those nesting in the Columbia River estuary, were identified as key avian predators that...
Resource Type:: Masters Thesis
Full Text:: : ______________________________________________________________ Daniel D. Roby Declines in wild salmonid (Oncorhynchus spp.) populations in the Columbia

Double-crested Cormorants (Phalacrocorax auritus) and Brandt’s Cormorants (P. penicillatus) Breeding at East Sand Island in the Columbia River Estuary : Foraging Ecology, Colony Connectivity, and Overwinter Dispersal

Creator:: Peck-Richardson, Adam
Abstract:: Double-crested cormorants (Phalacrocorax auritus) and Brandt’s cormorants (P. penicillatus) nest sympatrically in a large mixed-species colony on East Sand Island (ESI) in the Columbia River estuary. Ecological theory predicts that such morphologically similar species will partition prey resources when faced with resource limitations. During the summer of 2014, I investigated...
Resource Type:: Masters Thesis
Full Text:: Dispersal Abstract approved: Daniel D. Roby Donald E. Lyons Double-crested

Taxonomic analyses of the Oregon chub, Oregonichthys crameri

Creator:: Bills, Debra T.
Abstract:: The Oregon chub. Oregonichthys crameri. one of Oregon's endemic freshwater fishes. is restricted to the Willamette and Umpqua rivers and their tributaries. Specimens from the two rivers have traditionally been considered the same species. The goal of this study was to re-examine that assumption and determine if the Willamette Oregon...
Resource Type:: Masters Thesis
Full Text:: crameri AN ABSTRACT OF THE THESIS OF Debra T. Bills for the degree of Master of Science in Fisheries

Provisioning, growth and survival of Adélie penguin chicks at Cape Crozier, Ross Island, Antarctica

Creator:: Jennings, Scott
Abstract:: Understanding the factors that contribute to or limit reproductive success is a fundamental objective of the field of ecology, providing insight into the ways ecosystems function and facilitating better management of natural resources. Behaviors that benefit offspring often increase costs to parents, and thus parents must adjust their level of...
Resource Type:: Masters Thesis
Full Text:: success. I found that 1) male penguin chicks gained on average 15.6 g d-1 more, and grew bill length

Mercury accumulation in fish from Cottage Grove Reservoir and its tributaries

Creator:: Worcester, Thomas C
Abstract:: A fish sampling program was initiated at Cottage Grove Reservoir in June of 1974 to investigate mercury accumulation in the fish. Samples were collected periodicallv from June to November, 1974, and from June, 1975 through January, 1976 from both the reservoir and its tributaries. Species collected included spring chinook salmon...
Resource Type:: Masters Thesis
Full Text:: ACCUMULATION IN FISH FROM COTTAGE GROVE RESERVOIR AND ITS TRIBUTARIES Abstract approved: Dr. Donald R. Buhier

Some quantitative aspects of mercury accumulation by rainbow trout

Creator:: Phillips, Glenn R.
Resource Type:: Dissertation
Full Text:: ASPECTS OF MERCURY ACCUMULATION BYRAINBOW TROUT Abstract approved: Dr. Donald R. Buliler Rainbow trout

The influence of diet and dieldrin on the growth and body composition of underyearling rainbow trout

Creator:: Phillips, Glenn R.
Abstract:: The effects of a sublethal concentration of dieldrin (0. 2 ppb) in the water on the growth and body composition of underyearling rainbow and cutthroat trout held in aquaria and fed different rations of tubificid worms or Oregon moist pellets were studied at Oak Creek Fisheries Research Laboratory, Oregon State...
Resource Type:: Masters Thesis
Full Text:: for the Master of Science (Name) (Degree) in Fisheries (Major) presented on ))?.d /2'22 (Date

ScholarsArchive@OSU

Taxonomic status of the isolated populations of tui chub referred to Gila bicolor oregonensis (Snyder)

Foraging ecology of caspian terns and double-crested cormorants in the Columbia River Estuary

Bioenergetics-based predator-prey relationships between piscivorous birds and juvenile salmonids in the Columbia River estuary

Extrinsic and Intrinsic Factors Associated with Reproductive Success of Caspian Terns (Hydroprogne caspia) at East Sand Island, Columbia River Estuary

Double-crested Cormorants (Phalacrocorax auritus) and Brandt’s Cormorants (P. penicillatus) Breeding at East Sand Island in the Columbia River Estuary : Foraging Ecology, Colony Connectivity, and Overwinter Dispersal

Taxonomic analyses of the Oregon chub, Oregonichthys crameri

Provisioning, growth and survival of Adélie penguin chicks at Cape Crozier, Ross Island, Antarctica

Mercury accumulation in fish from Cottage Grove Reservoir and its tributaries

Some quantitative aspects of mercury accumulation by rainbow trout

The influence of diet and dieldrin on the growth and body composition of underyearling rainbow trout

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